Cathode active materials for li secondary cell and the fabrication method thereof

PURPOSE: A positive electrode active material for lithium secondary battery and a manufacturing method thereof are provided to improve electrochemical characteristic and high-rate characteristic by increasing diffusion velocity of the lithium ion within the positive electrode active material structure. CONSTITUTION: A manufacturing method of positive electrode active material for lithium secondary battery comprises the following steps: manufacturing active material precursor by mixing reacting raw material including metallic aqueous solution which contains nickel source, cobalt source, and aluminum source, and ammonia solution, sucrose, and pH adjusting agent; mixing the active material precursor with lithium source; and manufacturing anodic active material which is represented by chemical formula 1: Li_(1+z)Ni_(1-x-y)Co_xAl_yO_2 by plasticizing the mixture. In the chemical formula 1, z stands for real number of 0-0.3, x stands for real number of 0.05-0.3, y stands for real number which exceeds 0 and equal to or less than 0.3, 1-x-y is real number of 0.4 to 0.95.